SOLUTION: how do you find the area when they only give you the diameter?

Algebra ->  Surface-area -> SOLUTION: how do you find the area when they only give you the diameter?      Log On


   

Question 279972: how do you find the area when they only give you the diameter?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let r = radius
Le d = diameter
Area = pi%2Ar%5E2
diameter = 2 x radius
radius = diameter/2
Area = pi%2A%28d%2F2%29%5E2